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Stress Shadow on the Southwest Portion of the Longmen Shan Fault Impacted the 2008 Wenchuan Earthquake Rupture
Liu, Chang1; Dong, Peiyu2; Zhu BJ(朱伯靖)3; Shi, Yaolin4
通讯作者Liu, Chang(changliuu@tongji.edu.cn)
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
2018-11-01
卷号123期号:11页码:9963-9981
DOI10.1029/2018JB015633
产权排序第3完成单位
收录类别SCI
关键词The 2008 Wenchuan earthquake stress shadow unilateral propagation fault interaction the Xianshui He fault the Longmen Shan fault
摘要The 2008 Wenchuan earthquake (Mw7.9) unilaterally ruptured the Longmen Shan fault (LMSF) along eastern Tibet. The earthquake rupture propagated about 270km northeastward, whereas it propagated only about 20km southwestward along the strike of the fault. Although a significant attention has been paid to the question of predominantly unilateral propagation, the primary reasons for this type of propagation remain unclear. In this research, we examined the change of Coulomb stress along the LMSF caused by the historical earthquakes near and on the LMSF from 1725 to 2008. We found that the 14 preceding large earthquakes (M6.5) on the Xianshui He fault cast a stress shadow on the SW segment of the LMSF, which was not activated by the 2008 Wenchuan earthquake rupture. The 1970 Dayi earthquake on the SW segment of the LMSF contributed significantly to this stress shadow. Compared with the segment of the 2008 Wenchuan earthquake rupture, this stress shadow caused strong stress contrasts of -214, -22, and -80kPa in the seismic gap of the very SW segment of the LMSF, the rupture zone of the 2013 Lushan earthquake, and the seismic gap between the 2008 Wenchuan and 2013 Lushan earthquake ruptures, respectively. Stress contrasts in these values were consistent with tectonic loading over 165, 17, and 62years, respectively, by integrating an interseismic stress-loading rate of 1.3kPa/a. We proposed that this stress shadow might have created a barrier at the SW segment, preventing the earthquake rupture propagating southwestward.
资助项目National Key R&D Program of China[2017YFC0602001] ; Fundamental Research Funds for the Central Universities[22120180260] ; National Natural Science Foundation of China[41404075] ; National Natural Science Foundation of China[41704101] ; National Natural Science Foundation of China[41704098] ; National Natural Science Foundation of China[41590865]
项目资助者National Key R&D Program of China[2017YFC0602001] ; Fundamental Research Funds for the Central Universities[22120180260] ; National Natural Science Foundation of China[41404075, 41704101, 41704098, 41590865]
语种英语
学科领域地球科学
学科门类理学::地球物理学
文章类型Article
出版者AMER GEOPHYSICAL UNION
出版地2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
ISSN2169-9313
URL查看原文
WOS记录号WOS:000454775200051
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
关键词[WOS]W 6.6 LUSHAN ; TIBETAN PLATEAU ; EASTERN MARGIN ; XIANSHUIHE FAULT ; TECTONIC IMPLICATIONS ; VELOCITY STRUCTURE ; ACTIVE TECTONICS ; WESTERN SICHUAN ; CRUSTAL FLOW ; EVOLUTION
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/18250
专题太阳物理研究组
通讯作者Liu, Chang
作者单位1.State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
2.Institute of Seismology, China Earthquake Administration, and Hubei Earthquake Administration, Wuhan, China
3.Yunnan observatories, Chinese Academy of Sciences, Kunming, China
4.Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing, China
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Liu, Chang,Dong, Peiyu,Zhu BJ,et al. Stress Shadow on the Southwest Portion of the Longmen Shan Fault Impacted the 2008 Wenchuan Earthquake Rupture[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2018,123(11):9963-9981.
APA Liu, Chang,Dong, Peiyu,Zhu BJ,&Shi, Yaolin.(2018).Stress Shadow on the Southwest Portion of the Longmen Shan Fault Impacted the 2008 Wenchuan Earthquake Rupture.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(11),9963-9981.
MLA Liu, Chang,et al."Stress Shadow on the Southwest Portion of the Longmen Shan Fault Impacted the 2008 Wenchuan Earthquake Rupture".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.11(2018):9963-9981.
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